How to resolve the algorithm XML/XPath step by step in the Bracmat programming language

Published on 12 May 2024 09:40 PM
#Bracmat

How to resolve the algorithm XML/XPath step by step in the Bracmat programming language

Table of Contents

Problem Statement

Perform the following three XPath queries on the XML Document below: XML Document:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm XML/XPath step by step in the Bracmat programming language

Source code in the bracmat programming language

{Retrieve the first "item" element}
(   nestML$(get$("doc.xml",X,ML))
  :   ?
      ( inventory
      . ?,? (section.?,? ((item.?):?item) ?) ?
      )
      ?
& out$(toML$!item)
)

{Perform an action on each "price" element (print it out)}
(   nestML$(get$("doc.xml",X,ML))
  :   ?
      ( inventory
      .   ?
        ,   ?
            ( section
            .   ?
              ,   ?
                  ( item
                  .   ?
                    ,   ?
                        ( price
                        .   ?
                          ,   ?price
                            & out$!price
                            & ~
                        )
                        ?
                  )
                  ?
            )
            ?
      )
      ?
|
)

{Get an array of all the "name" elements}
(   :?anArray
  &   nestML$(get$("doc.xml",X,ML))
    :   ?
        ( inventory
        .   ?
          ,   ?
              ( section
              .   ?
                ,   ?
                    ( item
                    .   ?
                      ,   ?
                          ( name
                          .   ?
                            ,   ?name
                              & !anArray !name:?anArray
                              & ~
                          )
                          ?
                    )
                    ?
              )
              ?
        )
        ?
| out$!anArray {Not truly an array, but a list.}
);

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